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Typical Installation

Requirements for Electrical Installations
IET Wiring Regulations 17th Edition
PV Equipment on the DC side shall be considered to be energised, even when the system if disconnected from the AC side.


To allow maintenance of the PV converter, means of isolating the PV convertor from the DC side and the AC side shall be provided. 712.537.2.1.1

Fault protection:

Shall be provided for each source of supply or combination of sources of supply. 551.4.1

Division of Installation:

Every installation shall be divided into circuits, as necessary, to: (i) Avoid danger and minimise inconvenience in the event of a fault. (ii) Facilitate safe inspection, testing and maintenance. (vi) Prevent the indirect energising of a circuit intended to be isolated. 314.1

Overcurrent protection:

Should be located as near as practical to the generator terminals (where required). 551.5.1

Maximum disconnection times:

The maximum disconnection time shown in Table 41.1 shall be applied to final circuits not exceeding 32A. 0.4s TN System & 0.2s TT Systems. 411.3.2.2
Where an installation comprises more than one final circuit, each final circuit shall be connected to a separate way in a distribution board. The wiring of each final circuit shall be electrically separate from that of every other final circuit, so as to prevent the indirect energising of a final circuit intended to be isolated. 314.4